Fix the installation instructions
Merge pull request #1 from joshhepworth/patch-1

Fix the installation instructions
WIP 1 settlement submodule
Add an advisory calculator for the advisory shipment methods we may create in some cases
WIP 2 draft of extract_items_into_package
remove the testing section because there are no specs yet
Add some notes on the available extension hooks
first draft of payment settler
split order fetch and settlement into different controllers
order fetch: switch to ransack, add fault isolation
implement the Method|field:value shipcode syntax
switch to POST, some better defaults
tweak configuration.  implement refund adjustment creation.
routes for settlement
misc crash fixes for settlement
Add cancel support
small change to handling of captures.  Not sure if this is correct
be consistant about our API between 2.1.x and 2.2.x
we have decided it is better to clear out old option values entirely when the type list changes
redo property setting to configurably delete unmentioned properties.  also makes fewer queries